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Digestive Process Begins

Digestive Process Begins. Section 3. Functions of Digestive System. Breaks down food into molecules Molecules are absorbed into blood and carried throughout the body. Functions of Digestive System. Cont. Wastes are eliminated from the body. Digestion.

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Digestive Process Begins

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  1. Digestive ProcessBegins Section 3

  2. Functions of Digestive System • Breaks down food into molecules • Molecules are absorbed into blood and carried throughout the body

  3. Functions of Digestive System. Cont. • Wastes are eliminated from the body

  4. Digestion • Process by which the body breaks down food into small nutrient molecules

  5. Two Kinds of Digestion • Mechanical And Chemical

  6. Mechanical Digestion • Foods are physically broken down into smaller pieces. • Begins when you take your first bite of food • Your teeth are the first stage in mechanical digestion

  7. Chemical Digestion • Chemicals produced by the body break foods into smaller chemical building blocks. • Begins in the mouth

  8. Chemical Digestion, Cont. • Accomplished by enzymes • Enzymes – protein that speeds up chemical reactions in the body

  9. Absorption • Occurs after food has been digested. • Process by which nutrient molecules pass through the wall of the digestive system into the blood

  10. The Mouth • Saliva – fluid released when your mouth waters • Important role in both mechanical and chemical digestive processes.

  11. The Esophagus • A muscular tube that connects the mouth to the stomach • Is lined with mucus – a thick slippery substance – makes food easier to swallow and move through the system

  12. The Esophagus, Cont. • The epiglottis seals off the windpipe to prevent food from entering. • Peristalsis are involuntary waves of muscle contraction

  13. The Stomach • A j-shaped muscular pouch located in the abdomen • Most mechanical digestion occurs in the stomach along with chemical digestion

  14. The Stomach, Cont. • Digestive juice contains the enzyme pepsin and hydrochloric acid • Pepsin kills bacteria that enters with food

  15. The Stomach, Cont. • Hydrochloric acid helps the stomach to function properly. • Mucus coats and protects the stomach from acids

  16. The Stomach, Cont • Food remains in the stomach until all solid material has been broken down into liquid form. • Only takes a few hours for food to digest.

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